As RadarOnline.com has learned from Us Weekly reports, Montag gave birth to a baby boy, Gunner Stone, this Sunday October 1.
"Heidi and Spencer are proud parents of a healthy baby boy as of this afternoon," the couple's rep exclusively told Us.
"We are so blessed to have a beautiful healthy baby boy," said Montag, 31. "It was the hardest and most rewarding experience."
"It is officially the most lit day of my life," agreed Pratt, 34.
As Radar readers know, the love-struck duo spilled the news this April, later announcing that they got pregnant after only one month of trying!
Pratt and Montag have been married since 2009 and could not be more excited to start expanding their family. Congrats to the happy couple!
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